27. A newly prepared iron species (Angew. Chem. Int. Ed. 2017, 56, 7995-7999) was structurally characterized shown on the right. What is the electron count for this complex with Fe having four aryl groups bonded to it and a nitrogen-containing ligand? (A) 14 (B) 15 (C) 16 (D) 17 (E) 18.

4. Both ZnS and CaF₂ have a face-centered cubic unit cell where the S²⁻ and Ca²⁺ ions are closest packed in each structure. Which of the following is true? (A) There are 4 tetrahedral holes empty in each structure. (B) In both compounds, one-half of the tetrahedral holes are filled. (C) In both compounds, all the tetrahedral holes are filled. (D) There are 8 Zn²⁺ ions and 4 F⁻ ions in the unit cell. (E) In ZnS, one-half of the tetrahedral holes are filled by Zn²⁺ ions, whereas in CaF₂ all the tetrahedral holes are filled with F⁻ ions.

27. A newly prepared iron species (Angew. Chem. Int. Ed. 2017, 56, 7995-7999) was structurally characterized shown on the right. What is the electron count for this complex with Fe having four aryl groups bonded to it and a nitrogen-containing ligand?
(A) 14
(B) 15
(C) 16
(D) 17
(E) 18.

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